Acquisitions and Dispositions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 02, 2025	Dec. 31, 2024
Business Acquisition [Line Items]
Goodwill	$ (1,597,312)		$ (1,554,146)
ADK Group
Business Acquisition [Line Items]
Cash and cash equivalents		$ 34,200
Accounts receivable		19,798
Other current assets		3,025
Fixed assets		1,111
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		103
Other assets		591
Right-of-use lease assets - operating leases		1,241
Accounts payable		6,989
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accrued Media		(1,526)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other		(20,315)
Advance billings	$ (7,400)	(7,378)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other		(1,092)
Current portion of lease liabilities		(532)
Net liabilities assumed		(21,672)
Long-term portion of lease liabilities		$ (565)